If you're planning on taking the Network+ exam, you need to have a basic knowledge of decimal and binary numbering systems . While this is basic knowledge, it is still important. If you haven't used these numbering system in a while, they might be a little foggy.
For example, see if you can convert the following decimal numbers to four binary bits:
1
3
5
9
The answer is available here along with a deeper dive into comparing decimal and binary.